Method of and pattern for casting metal pipe elbows



Oct. 6, 1925. 1,555,999

C. L. LOVELESS METHOD 0F AND PATTERN FOR CASTING METAL PIPE ELBOWS vFiled May 22, 1.925 2 Sheets-Sheet. 1

nvmvnm 'fiarkJlloVekjzf BY ATTORNEY.

Oct. 6, 1925, v C. L. LOVELESS METHOD OF AND PATTERN FOR CASTING METAL PIPE ELBOWS Filed May 22, 1925 2 Sheets-Sheet 'NVENTOR.

ATTORNEY.

Paeai a Oct. 6, 1925.

UNITED STATES CHARLES L. LOVELESS, OF LOS ANGELES, CALIFORNIA.

METHOD OF AND PATTERN FOR CASTING METAL PIPE ELBOWS.

Application filed May 22, 1923.

To all whom it may concern:

Be it known that I, CHARLES L. LOVELESS, a citizen of the United States, residing at Los Angeles, in the county of Los Angeles and State of California, have invented new and useful Improvements in Methods of and Patterns for Casting Metal Pipe Elbows, of which the following is a specification.

My invention relates to the molding art and particularly to a new method of and pattern for casting soil pipe elbows and similar cored structures.

Heretofore, in the formation of molding flasks employed in the casting of metal soil pipe elbows and similar cored structures, the sand cores used for forming the openings in the castings have been supported in spaced relation to the molding cavities by arbors. Oftentimes the arbors become broken or displaced during the casting operation resulting in imperfect castings, the breakage of arbors occasioning an average loss of about 25% of the castings. Further, the use of core supporting arbors entails a loss of approximately six minutes in each casting operation.

By means of my novel method of forming casting molds, the necessity of employing arbors for supporting the cores within the molds is dispensed with, the end walls of the molding cavity being so formed that the core will be rigidly supported in spaced relation therewith, thereby resulting in a great saving of time in the casting operation as well as reducing the percentage of imperfect castings.

An important object of my invention is to provide a novel method of and pattern for forming molds employed in casting soil pipe elbows and like cored structures, in which the usual core supporting means is dispensed with.

A further object is to provide a method of forming molds for casting soil or other pipe elbows that will greatly reduce the time heretofore required in the formation of castm s.

Other objects and advantages will be apparent from the following description, reference being had to the drawings accompanya ing the same, in which:

Fig. 1 is a diagrammatic View illustrating the first step in the mold forming operation, that of forming the mold core.

Fig. 2 is a similar view illustrating the Serial No. 640,694.

second step, that of forming the molding cavity in the drag.

Fig. 8 is a similar section illustrating the third step in the mold forming operation, that of removing the drag mold and one half of the pattern member from the core.

Fig. 4: is a similar view illustrating the fourth step in the operation, showing the drag with the molding cavity formed therein placed upon the cope containing the core.

Fig. 5 is a similar View to Fig. 4:, illustrating the fifth step, with the mold inverted.

Fig. 6 is a view similar to the preceding views illustrating the sixth step, the cope and one of the pattern members being shown in detached relation to the drag member.

Fig. 7 illustrates a longitudinal section of the completed mold ready for a pouring operation.

Fig. 8 is a side elevation of the pattern.

Fig. 9 is a plan view of the pattern.

Fig. 10 is a transverse sectional view of the pattern taken on line 1010 of Fig. 9.

In practising my improved mold forming process for casting metal soil pipe elbows and similar cored structures, I preferably employ a metal pattern 5 of the desired form, separated centrally along its longitudinal axis into two complemental pattern members 6, and 7 the longitudinally ex tending edges of member 6 being provided with rabbets 8, while the longitudinally extending edges of member 7 are provioed with tongues 9 which engage the rabbets when the two members are placed together, and serve to prevent lateral displacement of the members during the mold forming operation. One end of pattern 5 is enlarged as at 10 to form the usual hub of the elbow.

Member 6 of the metal pattern is formed on a substantially fiat match plate 12, the longitudinally extending rabbeted edges 8, and its semi-circular ends 15 and 16 joining said plate, the body 17 of the pattern extending below the lower face of the plate, while the ends extend beyond the upper surface, as clearly shown in the various views of the drawings On the upper face of the match plate 12 adjacent the hub end 10 is a semicircular wall 18 which forms a trough 19 through which the molten metal flows into the mold cavity to form the casting when the mold is completed, as will be more clearly explained hereinafter. An aperture 20 is provided in wall 18 for the reception of the lower pointed end of a rod 21 for forming a duct 23 in the molding sand of the cope, through which the molten metal is directed to the molding cavity. Match plate 12 is provided on its oppositely disposed ends with ears 24;, each ear being provided with apertures 29.

In the formation of molds by my method, I employ the usual type of molding flask consisting of a cope 25 and a drag 26. On the end walls 27 of the drag at the center thereof and extending beyond one of the edges, are s uds 28, that engage apertures 29 formed in cars 2-1; of the match plate 12, and apertures 31 formed in ears 82 secured to end walls 33 of the cope 25, to insure the registration of the cope, drag, and pattern member 6 when placed together.

The manner of forming my mold for easting metal soil pipe elbows is as follows: The cope 25 is first placed on the molding bench, and the match plate 12 carrying memaer 6 of the pattern is placed on its upper edges, member 7 of the other half of the pattern being fitted to member 6, the tongues and rabbets of the two members holding the same against dislodgment. The interior area of the pattern 5 i then compactly rammed with sand to form the molding core 35, the end walls 36 of the core being evenly parted and covered with parting sand to prevent adherence of the end walls of the core with core supporting walls 37 formed in the drag member of the mold. The drag 26 is then placed on the upper edges of the cope as illustrated in Fig. 2, and rammed with sand to form an impression of member 7 of the pattern. Drag member 26 together with member 7 of the pattern is removed from the cope as in Fig. 3, and the drag replacer in. 4:. Br bottom board 40 is placed on the upper edges of the drag and the whole flask is inverted as in 5. The rod 21 for forming the metal pouring duct is then placed in position and the cope is compactly rammed with sand to form an impression of pattern member 6. Rod 21 and cope 25 are then withdrawn from the drag 26 and the match plate 12 carrying member 6 of the pattern removed, as shown in Fig. 6, the cope being then replaced on the drag as shown in Fig. 7, to form a com plete elbow mold.

As the core supporting walls 37 are in-- clined towards each other formingwedging surfaces for the end walls of the core 35, it will be seen that the core will be maintained in proper spaced relation to the molding cavities formed in the drag and cope when the completed mold is ready for a pouring operation.

In order to compensate for the space occupied by the match plate 12 between the mold sections when forming the mold, the thickness of wall 41 of pattern member 6 is increased to equal the thickness of the wall and match plate, so that when the plate is withdrawn and the two sections of the mold ar completed and placed together, the thickness of the wall cavities formed by the core 35 in each section will be equal.

From the foregoing description it will be noted that I have provided a novel method of forming molding forms, in which the core supporting arbors are entirely dispensed with. thus effecting a great saving of time in the formation of pipe elbow castings, as well as avoiding considerable expense heretofore occasioned by the frequent breakage and displacement of arbors.

What I claim is 1. A, pattern for forming elbow casting molds, comprising a pattern formed into the configuration of an elbow joint, said pattern being split longitudinally to form two cornplemental members, one of said members having a flat match plate formed integrally therewith.

2. A pattern for forming elbow casting molds, comprising two complemental pattern members forming when placed together a complete elbow pattern, and a substantially fiat match plate formed integrally with one of said pattern members, said match plate being joined to said pattern along its semi-circular ends and its longitudinally extending edges.

3. A pattern for forming elbow casting molds, comprising two complemental pat-- tern members, one of said members consisting of a plate having one half of the elbow pattern formed integrally therewith, and the other of said members being shaped in the configuration of the other half of the elbow, said member when mounted on the pattern formed on said first named member forming a complete elbow pattern.

l. A pattern for forming elbow casting molds, comprising a match plate member having one half of the longitudinal length of the elbow pattern formed integrally therewith, the body portion of said pattern being disposed below said match plate and th end portions extending above the upper face of said plate, whereby to form core supportin abutments in the mold section when the mold is completed, and a second pattern member consisting of a duplicate of the half pattern formed on the match plate, said second pattern detachably secured to the pattern formed on the match plate to form a complete molding pattern.

In witness that I claim the foregoing I have hereunto subscribed my name this 80th day of April, 1923.

CHARLES L. LOVELESS. 

